knapweed

Earth Notes
9:29 am
Wed November 16, 2011

Earth Notes: Controlling a Weed—With a Bug

Diffuse knapweed
http://beavercreek.nau.edu/Animal%20and%20Plant%20pages/Invasive/Plants/Centaurea%20D.htm

When it comes to controlling the many non-native, invasive plants in northern Arizona, weed warriors call on every tactic in the book. As they seek to minimize the spread of a weed called diffuse knapweed, they’re turning to a tiny ally: a weevil that loves to eat knapweed seeds.

Diffuse knapweed is a low-growing shrub that originated on the Russian steppes. Since the 1980's, it’s taken over roadsides and pastures in the region. It’s a heavy seed producer and a tough competitor against native plants.

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